ADS1248是TI公司的一款精密ADC(<=10MSPS)产品，ADS1248是具有集成低噪声 PGA（增益为 128 时偏移仅为 48nV）的精密 24 位 ADC，本页介绍了ADS1248的产品说明、应用、特性等，并给出了与ADS1248相关的TI元器件型号供参考。
ADS1248 - 具有集成低噪声 PGA（增益为 128 时偏移仅为 48nV）的精密 24 位 ADC - 精密ADC(<=10MSPS) - 模数转换器 - TI公司（Texas Instruments，德州仪器）
The ADS1246, ADS1247, and ADS1248 are highly-integrated, precision, 24-bit analog-to-digital converters (ADCs). The ADS1246/7/8 feature an onboard, low-noise, programmable gain amplifier (PGA), a precision delta-sigma (ΔΣ) ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1247 and ADS1248 also provide a built-in, very low drift voltage reference with 10mA output capacity, and two matched programmable current digital-to-analog converters (DACs). The ADS1246/7/8 provide a complete front-end solution for temperature sensor applications including thermal couples, thermistors, and RTDs.
An input multiplexer supports four differential inputs for the ADS1248, two for the ADS1247, and one for the ADS1246. In addition, the multiplexer has a sensor burnout detect, voltage bias for thermocouples, system monitoring, and general-purpose digital I/Os (ADS1247 and ADS1248). The onboard, low-noise PGA provides selectable gains of 1 to 128. The ΔΣ modulator and adjustable digital filter settle in only one cycle, for fast channel cycling when using the input multiplexer, and support data rates up to 2kSPS. For data rates of 20SPS or less, both 50Hz and 60Hz interference are rejected by the filter.
The ADS1246 is offered in a small TSSOP-16 package, the ADS1247 is available in a TSSOP-20 package, and the ADS1248 in a TSSOP-28 package. All three devices are rated over the extended specified temperature range of –40°C to +105°C.
- 24 Bits, No Missing Codes
- Data Output Rates Up to 2kSPS
- Single-Cycle Settling for All Data Rates
- Simultaneous 50/60Hz Rejection at 20SPS
- 4 Differential/7 Single-Ended Inputs (ADS1248)
- 2 Differential/3 Single-Ended Inputs (ADS1247)
- Low-Noise PGA: 48nV at PGA = 128
- Matched Current Source DACs
- Very Low Drift Internal Voltage Reference: 10ppm/°C (max)
- Sensor Burnout Detection
- 4/8 General-Purpose I/Os (ADS1247/8)
- Internal Temperature Sensor
- Power Supply and VREF Monitoring (ADS1247/8)
- Self and System Calibration
- SPI™-Compatible Serial Interface
- Analog Supply Unipolar (+2.7V to +5.25V)/Bipolar (±2.5V) Operation
- Digital Supply: +2.7V to +5.25V
- Operating Temperature –40°C to +125°C
